Fluid-pressure cut-off.



R. DAVIS. FLUID PRESSURE GUT-OFF.

APPLICATION FILED MAY 28, 1908.

REX `DAVIS, OF SALEM, WEST VIRGINIA.

FLUID-PRESSURE CUT-OFF.

Speciflcationvof Letters Patent.

Patented March 23, ieoe.

applicati@ med my 2s, 190s. serai No. 435,015.

To all whom 'it may concern:

Be it known that I, REX DAvIs, a citizen of the United States, residing at Salem, in the count ofiHarrison and State of West Vir inia, ave invented a new and'useful Fluid-Pressure Cut-Off, of which the following is a specification.

This invention relates to fluid pressure cut-offs such as are used in gas lines to auto- ,'15 matically close the supply pipe when the pressure falls below a predetermined point.

The object of the invention is to provide an improved forni of such cut-olf 'which shall be free from multiplicity of parts and 1-5 simple and easy of construction, and positive in operation. Y

The invention consists in a valve 'casing having a pair of valve seats with a common valve, the position of the valve on one of 21g/the seats closing the fluid" pressure supply line, and the position of the valve on the.

f otherseat closing and opening connection to the atmosphere, together withcertain other novelfeatures of construction and combinaarts hereinafter fully described,

illustrate in the accompanyin drawings, and specifically set forth in the c aims.

' In the accompanying drawings, reference characters are used to indicate the various 30 parts, and the view is a longitudinal section ,pipeia Y For the urposes of4 this device I use a special tee t e stem of which is indicated at 45 17 connected to the. lobe valve 13 and the cross portion at'18. hese two portions are preferably made equal in. cross-sectional area and in order to accomplish an object hereiny after to be described a plurality 'of fingers 19 r U50 are'l provided between the two portions.`

:'.Mounted upon each end ofthe .tee 18 is a. .f l ball valve seat. 20 arranged to coact with a f ball valve 21.- l 1 J The pipe 16 hasj-'fitted thereon atee 22 H55 whichis conneetedgt the lower valve seat tting 20 by' a pipef23.`

the ball will be hel A pipe 24 leads from,

the tec 22 andA pipe 23 to the'supply pipe for the gas or other'v burners. Mounted upon the end of the u per ball valve iitting is an expansion cham er 2,5 which is provided 6 with a pet-cock 26 opening to the atmosphere. On this expansion chamber there is also provided an automatic valve- 27v arranged to close when the pressure within the chamber 25 becomes greaterI than that of the 6 atmosphere. It is to be observed that different varieties of balls 21 may be used for' this purpose and that the same will depend largely on the degree of pressure retained within the piston. That Yis to say 7 theweight of the ball valve 21 will be in direct ratio tol the degree of pressure Amaintained. l p

In order to understand the operation of'the device let it be sup osed that the same is 7 connected to the as e of a house. In the y normal course o operation, ythat is to say when the as is flowing freely through the pipe vand tie pressure 1s of the required degree, the gas will pass through thepipe 10,V g

tee 1l pipe 12, valve 13, and the special tee 17 and 18 forming the ball valve casing. From there it passes to the ball4 valve fittin 20 a't the lower end' of the body of the specia tee into the pipe 23 through the tee 22, into 8 the pipe 24, and from there it passes to the burner. When the arts are in this condition in the upper ball valve seat'as indicated in the figure. lDuring the flow of the gas in this manner the valve 15 will 9 be closed and the valve 13v opened. The petcock 26 will also be closed while the valve 27 will be opened to the atmosphere if the pressure in the expansion chamber 25' is not reater than the atmospheric pressure. A Now g Ict it be assumed that the pressure in the line drops below that.` at which the. device is intended to maintain it. The ball valve 21 will. then'fall from-its upper seat and osition in the lower seat; This will cut off a supply of 1 gas to thel'ohting burners and the parts will remainin t is condition until properly at# tended to When it is discovered that the lights are out the person in Acharge of them first turns olf all the burners that have been; lighted, he then closes the valve 13 and opens the pet-cock 26. The valve 15 is then opened and the gas passes through the pipes 10, 14, 16 and 24, a ortionof` the pressure being exerted thrcugxh the pi e 23. This last men- 1 "tioned portion raises t e ball valve 21 to its upperseat asshown-m the figure. The petcock 26 is then closed and if the pressure be sufficient the ball valve will remain in that seat.

closes valve, 15 thus establishing the relation of the parts in the same manner as shown in the gue. It is to be observed that the ball valve 21 is prevented from entering the portion 17 of the special tee forming the valve casing by means of the noers 19. Were it not for these fingers the ball' valve might roll into the portion 17 and thus render the device inoperative.

, There has thus been rovided a simple and efficient device ofthe c aracter described.

A It is to be noted that this device may be made almost entirely of stock parts and that the valve therein used is of very simple construction having but the one moving part, that is to say the ball.

Having thusv described 'the invention whatv Acommunication with the atmosphere..

2.L In a device of the character described,- a valve casing, a pair of valve seats, a valve arranged to position on either of said seats, a pipe-opening 'into said casing between said seats, a second pipe leading from said casing. the opening of which is closed by one position of the valve, a connection to the atmosphere lf the ball valve remains in the upper y seat the attendant opens the-valve 13 and pipe.

thevopening to which is closed by 'a'second I position of said valve, and'v a third pipe connecting the first and second mentioned pipes and provided With a valve.

3. In a device of the character described, a valve casing, a ball valve, a pair of seats therefor in said casing, a valved pipe opening into said casing between said ball valve seats, a

second pipe leadingfromsaid'casing the opening to which is closed by one position of the ball valve, a connection between said casing and the atmosphere the opening to which is closed a second position of sald ball valve, 1 and a third plipe provided with a valve and4 connecting e rst and second mentioned pipes, the connection to the first pipebeing position of the valve intha't anterior to the 4. In a device of the character described,

a valve casing, a ball valve, a pair of seatsl therefor in said casing, a valved ipe opening.

into said casing between said ba valve seats, a second pipe leadl from said casing the ope to which islblsed by one position of the ba nected to said valve casin the opening to which is closed by a secon osition of said ball valve, a pet-cock and. c eck-valve connected to said expansion chamber and afforda the first and' second mentioned pipes, the

valve, anl expansion chamber coninpmmunication with the atmosphere, and t d pipe provided with a v alve connecting point of connection with thefirst pipe being anterior to the valve in that pipe.

AIn testimony that I claim'the foregoing as Y my own, `I have heretoV affixed my signature in the presence of two witnesses.'

REX DAVIS. Witnesses z' R. C. DAvIs, WM. 'HYEL 

